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Currently, her main academic interests focus on web applications, mobile development, software engineering, databases and telecommunications.","sameAs":["https://www.javacodegeeks.com"],"url":"https://examples.javacodegeeks.com/author/katerina-zamani/"}]}

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{"@context":"http:\/\/schema.org","@type":"Article","dateCreated":"2014-04-11T11:31:25+03:00","datePublished":"2014-04-11T11:31:25+03:00","dateModified":"2020-07-15T10:24:31+03:00","headline":"String to Double Java Example","name":"String to Double Java Example","keywords":"Double","url":"https:\/\/examples.javacodegeeks.com\/string-to-double-java-example\/","description":"In this article, we will show you how to convert string to double in java. String to Double conversion in Java is a frequent procedure because both data types are commonly used. As you can imagine in","copyrightYear":"2014","articleSection":"String","articleBody":"\nIn this article, we will show you how to convert string to double in java. String to Double conversion in Java is a frequent procedure because both data types are commonly used. \n\n\n\nAs you can imagine in this example we are going to show all the possible ways of converting String object to Double object.\n\n\n\n1. Syntax of the convert operations\n\n\n\nFirst of all, in order to convert a string to double, we can simply create a Double by setting the specified string to its constructor. Otherwise there are two different operations:\n\n\n\npublic static Double valueOf(String s): it is a static method that returns a Double object, which keeps the double value of the specified Stringpublic static double parseDouble(String s): this is also a static method that returns a new double, represented by the String we specified.\n\n\n\n\n\n\n\nBoth operations throw NumberFormatException if the string argument is not a parsable number.\n\n\n\n2. Example of String to Double conversion in Java\n\n\n\nThis is an example of how to convert string to double in java. Create a java class with the name StringToDoubleClass and paste the following code.\n\n\n\nStringToDoubleClass.java\n\n\n\n\n\n\n\n\n\n01\n02\n03\n04\n05\n06\n07\n08\n09\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n27\n28\n29\n30\n31\n32\n33\n34\n35\n36\n37\n38\n39\n40\n41\n42\n43\n\n\n\npackage com.javacodegeeks.core.stringtodouble;\n \npublic class StringToDoubleClass {\n \n    public static void main(String[] args) {\n         \n        String doubleTest = \"10.0\";\n        String doubleTest2 = \"-0010.0000\";\n         \n        Double d1 = new Double(doubleTest);\n        System.out.println(\"Use of Double constructor: \"+ d1);\n         \n        try {\n            \/\/ use of valueOf with both test strings\n            Double d2 = Double.valueOf(doubleTest);\n            System.out.println(\"Use of valueOf with doubleTest: \"+ d2);\n             \n            Double d2test = Double.valueOf(doubleTest2);\n            System.out.println(\"Use of valueOf with doubleTest2: \"+ d2test);\n             \n            \/\/ use of parseDouble with both test strings\n            double d3 = Double.parseDouble(doubleTest);\n            System.out.println(\"Use of parseDouble with doubleTest: \"+ d3);\n             \n            double d3test = Double.parseDouble(doubleTest2);\n            System.out.println(\"Use of parseDouble with doubleTest2: \"+ d3test);\n             \n            \/\/ give an int-string\n            double dInt = Double.parseDouble(\"12\");\n            System.out.println(\"Int to parseDouble: \"+ dInt);\n             \n            \/\/ error condition\n            Double dError = Double.valueOf(\"jcg\");\n            System.out.println(\"Error to valueOf: \"+ dError);\n             \n        } catch (NumberFormatException  e) {\n            System.err.println(\"NumberFormatException in valueOf, \"+ e.getMessage());\n \n        }\n         \n    }\n \n}\n\n\n\n\n\n\n\n\n\n\nNow lets explain the code above a little bit. Notice that the value of doubleTest2 is a negative double number with two leading zeros and some extra zeros in the decimal part. As you can see in the output below, both valueOf() and parseDouble() methods return -10.0 number. Also in the situation of the parameter dInt, if the specified string represents an integer, the two operations convert it to double again. Of course, if the string can not be parsed to a number, NumberFormatException is thrown.\n\n\n\nBelow are the results of the code execution.\n\n\n\nOutput\n\n\n\nUse of Double constructor: 10.0\nUse of valueOf with doubleTest: 10.0\nUse of valueOf with doubleTest2: -10.0\nUse of parseDouble with doubleTest: 10.0\nUse of parseDouble with doubleTest2: -10.0\nInt to parseDouble: 12.0\nNumberFormatException in valueOf, For input string: \"jcg\"\n\n\n\n3. Download the source code\n\n\n\nThis was an example of string to double in Java. \n\n\n\nDownload\nDownload the source code of this example: String to Double Java Example\n\n\n\nLast updated on Apr. 22nd, 2020\n","publisher":{"@id":"#Publisher","@type":"Organization","name":"Examples Java Code Geeks","logo":{"@type":"ImageObject","url":"\/wp-content\/uploads\/2013\/05\/JavaCodeGeeks-logo.png"},"sameAs":["https:\/\/feeds.feedburner.com\/examplesjavacodegeeks","https:\/\/www.facebook.com\/javacodegeeks","https:\/\/twitter.com\/javacodegeeks","https:\/\/www.linkedin.com\/groups\/3810709\/","https:\/\/www.youtube.com\/channel\/UCxoUc7Rar2q90Gu0nT2ffuQ","https:\/\/github.com\/javacodegeeks\/"]},"sourceOrganization":{"@id":"#Publisher"},"copyrightHolder":{"@id":"#Publisher"},"mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/examples.javacodegeeks.com\/string-to-double-java-example\/","breadcrumb":{"@id":"#Breadcrumb"}},"author":{"@type":"Person","name":"Katerina Zamani","url":"https:\/\/examples.javacodegeeks.com\/author\/katerina-zamani\/"},"image":{"@type":"ImageObject","url":"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg","width":1200,"height":150}}